Android Programming Simplified one

D:\chandreadymadeshop\app\src\main\res\layout\activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    
android:layout_width="match_parent"   
 android:layout_height="match_parent"   
  android:background="@drawable/chandra">
    <LinearLayout      
   android:layout_width="match_parent"    
       android:layout_height="match_parent"   
         android:orientation="vertical">

        <TextView         
  android:id="@+id/TV1" 
  android:layout_width="wrap_content"  
 android:layout_height="wrap_content"  
  android:text="Select Whatever you Want !!"     
  android:textColor="@android:color/holo_red_dark"   
  android:textSize="20sp" />


        <CheckBox           
    android:id="@+id/CB1"          
    android:layout_width="wrap_content"          
    android:layout_height="wrap_content"           
    android:checked="false"           
    android:text="Silk Saree"           
    android:textColor="#F00" />

        <CheckBox           
  android:id="@+id/CB2"           
  android:layout_width="wrap_content"           
  android:layout_height="wrap_content"          
   android:checked="false"          
    android:text="Synthetic Saree"           
    android:textColor="#F0F" />

        <CheckBox           
  android:id="@+id/CB3"           
  android:layout_width="wrap_content"           
  android:layout_height="wrap_content"           
  android:checked="false"           
  android:text="Cotton Saree"           
  android:textColor="#F00F" />
        <CheckBox           
  android:id="@+id/CB4"           
  android:layout_width="wrap_content"           
  android:layout_height="wrap_content"           
  android:checked="false"           
  android:text="Jute Saree"           
  android:textColor="#ff00" />
        <Button           
  android:layout_width="314dp"           
  android:layout_height="wrap_content"           
  android:text="PRESS IT"           
  android:id="@+id/btn"           
  android:background="#f8f40b"           
  android:textColor="#fd0707"/>
    </LinearLayout>
</ScrollView>

-----------------------------------------------------------------------------

D:\chandreadymadeshop\app\src\main\java\com\ldc\chandreadymadeshop\MainActivity.java

package com.ldc.chandreadymadeshop;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    Button btn;
    CheckBox cb1, cb2, cb3,cb4;

    TextView v1;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        cb1=(CheckBox) findViewById(R.id.CB1);
        cb2=(CheckBox) findViewById(R.id.CB2);
        cb3=(CheckBox) findViewById(R.id.CB3);
        cb4=(CheckBox) findViewById(R.id.CB4);
        btn=(Button) findViewById(R.id.btn);
        v1=(TextView) findViewById(R.id.TV1);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                String txt=" ";
                if(cb1.isChecked() == true )
                    txt=(String)cb1.getText();
                if(cb2.isChecked() == true )
                    txt=txt+", "+(String)cb2.getText();
                if(cb3.isChecked() == true )
                    txt=txt+"  , "+(String)cb3.getText();
                if(cb4.isChecked() == true )
                    txt=txt+"  , "+(String)cb4.getText();
                v1.setText("You have Selected "+txt);

                if(cb1.isChecked() == false && cb2.isChecked()==false && cb3.isChecked()==false && cb4.isChecked()==false)

                {
                    Toast.makeText(getBaseContext(),"OOPS! you haven`t selected anythng (: (: ",Toast.LENGTH_LONG).show();
                    v1.setText("You haven't Selected (: (; (: "+txt);
                }



            }
        });
    }
}
----------------------------------------------------------------------------------------